mirror of
https://github.com/juce-framework/JUCE.git
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137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library - "Jules' Utility Class Extensions"
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Copyright 2004-11 by Raw Material Software Ltd.
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------------------------------------------------------------------------------
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JUCE can be redistributed and/or modified under the terms of the GNU General
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Public License (Version 2), as published by the Free Software Foundation.
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A copy of the license is included in the JUCE distribution, or can be found
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online at www.gnu.org/licenses.
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JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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------------------------------------------------------------------------------
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To release a closed-source product which uses JUCE, commercial licenses are
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available: visit www.rawmaterialsoftware.com/juce for more information.
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==============================================================================
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*/
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ComponentMovementWatcher::ComponentMovementWatcher (Component* const component_)
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: component (component_),
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lastPeerID (0),
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reentrant (false),
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wasShowing (component_->isShowing())
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{
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jassert (component != nullptr); // can't use this with a null pointer..
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component->addComponentListener (this);
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registerWithParentComps();
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}
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ComponentMovementWatcher::~ComponentMovementWatcher()
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{
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if (component != nullptr)
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component->removeComponentListener (this);
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unregister();
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}
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//==============================================================================
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void ComponentMovementWatcher::componentParentHierarchyChanged (Component&)
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{
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if (component != nullptr && ! reentrant)
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{
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const ScopedValueSetter<bool> setter (reentrant, true);
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ComponentPeer* const peer = component->getPeer();
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const uint32 peerID = peer != nullptr ? peer->getUniqueID() : 0;
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if (peerID != lastPeerID)
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{
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componentPeerChanged();
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if (component == nullptr)
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return;
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lastPeerID = peerID;
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}
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unregister();
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registerWithParentComps();
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componentMovedOrResized (*component, true, true);
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if (component != nullptr)
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componentVisibilityChanged (*component);
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}
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}
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void ComponentMovementWatcher::componentMovedOrResized (Component&, bool wasMoved, bool wasResized)
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{
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if (component != nullptr)
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{
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if (wasMoved)
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{
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const Point<int> pos (component->getTopLevelComponent()->getLocalPoint (component, Point<int>()));
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wasMoved = lastBounds.getPosition() != pos;
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lastBounds.setPosition (pos);
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}
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wasResized = (lastBounds.getWidth() != component->getWidth() || lastBounds.getHeight() != component->getHeight());
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lastBounds.setSize (component->getWidth(), component->getHeight());
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if (wasMoved || wasResized)
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componentMovedOrResized (wasMoved, wasResized);
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}
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}
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void ComponentMovementWatcher::componentBeingDeleted (Component& comp)
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{
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registeredParentComps.removeFirstMatchingValue (&comp);
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if (component == &comp)
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unregister();
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}
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void ComponentMovementWatcher::componentVisibilityChanged (Component&)
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{
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if (component != nullptr)
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{
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const bool isShowingNow = component->isShowing();
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if (wasShowing != isShowingNow)
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{
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wasShowing = isShowingNow;
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componentVisibilityChanged();
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}
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}
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}
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void ComponentMovementWatcher::registerWithParentComps()
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{
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Component* p = component->getParentComponent();
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while (p != nullptr)
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{
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p->addComponentListener (this);
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registeredParentComps.add (p);
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p = p->getParentComponent();
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}
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}
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void ComponentMovementWatcher::unregister()
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{
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for (int i = registeredParentComps.size(); --i >= 0;)
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registeredParentComps.getUnchecked(i)->removeComponentListener (this);
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registeredParentComps.clear();
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}
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